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Baltimore Inner Harbor at night
BWI
Baltimore
Ontario California aerial with San Gabriel Mountains
ONT
Ontario

Baltimore → Ontario

Frontier Airlines · Round Trip · Nonstop

Save $80 (30% off)
Compared to the typical price of $266
$186$266

per person · round trip

Book This Deal

Flight Details

Cabin
Economy
Departs
Apr 21, 2026
Returns
Apr 22, 2026

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